To fix these problems, try clearing your browser's cache, and ensure that you are using the latest update of a modern browser, such as Google Chrome or Firefox.
If your high score is higher than those on the game page, then your score should be on the page. You will need to refresh the page for this information to be updated.
If your total high score is higher than those on the global leaderboard page, then your score should be on the page. You will need to refresh the page for this information to be updated. Note: your total high score is the one shown on your profile.
You can visit the 'settings' page when logged in to change your password. Please note that you must provide your current password in order to make changes to your account.